Old 07-20-2006, 01:21 AM   #1
htgguy
Member
 
htgguy's Avatar
 
Join Date: Jul 2006
Posts: 57
Default Can You Help Me Understand Sharpening?

I had this shot rejected for Undersharpened (Soft):
http://www.railpictures.net/viewreject.php?id=269424
I usually look at the numberboards and pilot area for an indication of how sharp the photo is, this one looked ok but not great to me. What is the best way to correct this in the future? I do think there is something just not quite right about the picture but I can't quite put my finger on it. All suggestions appreciated.

Jim
htgguy is offline   Reply With Quote
Old 07-20-2006, 01:27 AM   #2
VirginiaSouthern
Banned
 
VirginiaSouthern's Avatar
 
Join Date: Oct 2005
Location: Sumter, SC
Posts: 391
Send a message via AIM to VirginiaSouthern Send a message via Yahoo to VirginiaSouthern
Default

This one might not be salvageable. It looks like its suffereing from heat distortion as well as flare from the lights.
VirginiaSouthern is offline   Reply With Quote
Old 07-20-2006, 01:44 AM   #3
busyEMT
Senior Member
 
busyEMT's Avatar
 
Join Date: Oct 2003
Location: Minneapolis
Posts: 902
Default

Look at the rails nearest the bottom of the frame. They are soft, and the glint from the headlight is glowing; as is the whistle/mile post sign.

The whole face of the 7153 appears blurry. As VS wrote, this one may not be salvageable.
__________________
Aaron Florin- Click Here to view my photos at RailPictures.Net!
Visit Twin Cities Railfan.com
Visit the Twin Cities Railfan forums.

Don't do anything you wouldn't want to explain to the paramedics!
busyEMT is offline   Reply With Quote
Old 07-20-2006, 02:42 AM   #4
hoydie17
We Own The Night...
 
hoydie17's Avatar
 
Join Date: May 2005
Location: Centreville, VA
Posts: 799
Send a message via AIM to hoydie17 Send a message via Yahoo to hoydie17
Default

Quote:
Originally Posted by htgguy
I had this shot rejected for Undersharpened (Soft):
http://www.railpictures.net/viewreject.php?id=269424
I usually look at the numberboards and pilot area for an indication of how sharp the photo is, this one looked ok but not great to me. What is the best way to correct this in the future? I do think there is something just not quite right about the picture but I can't quite put my finger on it. All suggestions appreciated.

Jim

Seriously, one of your best resources for this type of info, is right in front of you. The internet, a quick Google search turned up hundreds of good articles about sharpening.

In a nutshell, try to think of sharpening as enhancing the definition or "edges" where colors change on a photo. Too much sharpening will leave halos, or strong white undertones to everything, where too little will make the colors blend and blurr. Hence making it hard to pick out the edges of your subject(s).

HTH
Sean
__________________
See my work on FLICKR: Night Stalker Photo Works on FLICKR

Or if you want to see my work here at RP.net? Click here.

"It's just a damn train son!"
hoydie17 is offline   Reply With Quote
Old 07-20-2006, 08:00 AM   #5
alan-crotty
Senior Member
 
alan-crotty's Avatar
 
Join Date: Mar 2006
Location: Ashford Kent England
Posts: 349
Default Under sharpened

I tried to look at the exposure details of you pic' , focal length, shutter speed etc. but there was no EXIF data. Looks like a fairly long lens, so photographic technique may be the initial problem, long lens, slow shutter, or just a missed focus.

As Sean says, sharpening is mainly edge enhancement, this will cause problems within the image where colours change at a place which is not a true edge. You then get sharpening artifacts, these can be reduced by using the "Threshold" slider in unsharp mask.

I've had a go at reworking your image, sharpened 300% @ 0.6 radius with threshold set to 3. reworked bnsf7153.jpg.71503.jpg

I've also darkened down some of the burnt out highlights so they don't 'glow'

Although a lot of rescue work can be done within an editing package you can't beat getting it right in the camera.

I typed "Sharpening in Photoshop" into Google and got over 700,000 results, there are plenty on online tutorials on this subject so have a look.

Unless this was very rare power or unusual working, I'd forget it and go out and enjoy taking more and better images.

Alan
Attached Images
File Type: jpg reworked bnsf7153.jpg.71503.jpg (136.9 KB, 142 views)

Last edited by alan-crotty; 07-20-2006 at 08:01 AM. Reason: missed a line out re EXIF data
alan-crotty is offline   Reply With Quote
Old 07-20-2006, 01:30 PM   #6
Joe the Photog
Senior Member
 
Joe the Photog's Avatar
 
Join Date: Feb 2005
Location: Columbia, SC
Posts: 7,910
Default

It's hard to fix a soft focus in post processing. Sometimes it's possible, but in the above version, I think the overall shot suffers more from trying to fix the soft focus than from the actual soft focus.


Joe
__________________
Joe the Photog Dot Com
Joe the Photog is offline   Reply With Quote
Old 07-21-2006, 03:00 AM   #7
Switched out
Senior Member
 
Switched out's Avatar
 
Join Date: Jan 2006
Location: Melbourne, Australia
Posts: 396
Default

I also think it might be suffering from to much JPG compression and/or it might be a crop from a larger photograph.
Switched out is offline   Reply With Quote
Old 07-22-2006, 01:21 AM   #8
hoydie17
We Own The Night...
 
hoydie17's Avatar
 
Join Date: May 2005
Location: Centreville, VA
Posts: 799
Send a message via AIM to hoydie17 Send a message via Yahoo to hoydie17
Default

The more I look at the photo it seems as though it's a very long focal point, and it also looks like heat shimmers coming off the rail as the air is cooling. I think that may also be what is causing the distortion, not just a lack of focus.

Sean
__________________
See my work on FLICKR: Night Stalker Photo Works on FLICKR

Or if you want to see my work here at RP.net? Click here.

"It's just a damn train son!"
hoydie17 is offline   Reply With Quote
Old 07-22-2006, 02:42 AM   #9
FLODO
Member
 
Join Date: Dec 2005
Location: Glen Ellyn Illinois
Posts: 53
Default

Ant the engine, and select sharpen.
__________________
Being a DJ, a Train Fan, and a person has its advantages...

Check out my photos at http://www.railpictures.net/showphotos.php?userid=7492

railpictures.net
FLODO is offline   Reply With Quote
Old 07-22-2006, 05:35 PM   #10
htgguy
Member
 
htgguy's Avatar
 
Join Date: Jul 2006
Posts: 57
Default

Thanks for all the suggestions. I will definitely just let this one slide. I did notice the huge amount of headlite flare, is there any way to control that in the future? Also, this was taken late in the day on a very hot day. Is there anything I should be doing to deal with the heat shimmer that is showing up in a lot of my shots on these hot evenings, or is that part of the beauty of summer evenings?

Jim
htgguy is offline   Reply With Quote
Old 07-22-2006, 06:20 PM   #11
a231pacific
Senior Member
 
a231pacific's Avatar
 
Join Date: Jun 2006
Posts: 822
Default

The irony of summer is, the days are longer, we have vacation time and the shooting light is crap!

Put your long lens away on hot days, unless you find a spot where heat shimmer actually will enhance the drama of the shot. Telephoto lenses exagerate heat shimmer.

Get off axis to control headlight flare, either above or to the side. Also, by using a non-tele, you will be a bit more off axis, as the train will be closer to you when you shoot. This might help the lens flare problem. If you are shooting digital, you might try bracketing your shot to underexpose some frames by 1/3 or even 2/3 and then use Photo Shop to lighten everything except the head and ditch lights. Try some different combinations of shutter speed and aperture. You may find that there are some f-stops that give less flare.

Yet another reason for not shooting wedgies!

Michael Allen
a231pacific is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT. The time now is 02:02 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.